We are a company with multiple satellite locations and all are connected with WAN links back to corporate. Our addressing scheme has been very simple
10.1.1.x 255.255.255.0 Corporate
10.1.2.x 255.255.255.0 Site 2
10.1.3.x 255.255.255.0 Site 3
10.1.4.x 255.255.255.0 Site 4
10.1.5.x 255.255.255.0 Site 5
The satellites don't have many devices...maybe 2 dozen and we've been working like this for 4 years now without any problems, until now. Our corporate location has run out of IP addresses. My first thought is to re-number the 10.1.2.x site to a totally different IP and change the subnet at corporate to encompass 10.1.1x and 10.1.2.x, but I'm not sure what the subnet mask would be. Also, I'm wondering is this the best idea? If not, what would you suggest?